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以一台点火式电控发动机为研究对象,利用气相色谱仪对裂解气的成分进行了在线检测,裂解气中除含有H_2和CO外,还含有一定量的CH_3OH蒸汽,三者的含量分别为:23.3%～46%,11.6%～23%和31%～65%;对不同转速和负荷下的气缸压力进行了测量,并计算了其压力升高率和放热率,结果表明:裂解气发动机的最高燃烧压力和压力升高率及最大放热率与裂解率有关。对于裂解率低的工况,由于裂解气的放热较汽油慢,最高燃烧压力和压力升高率及最大放热率也较汽油低;而对于裂解率高的工况,由于裂解气中含氢量的增加,使裂解气的放热较汽油快,裂解气的最高燃烧压力和压力升高率均高于汽油。
Taking an ignition type electronically controlled engine as the research object, the composition of cracked gas was detected online by gas chromatography. The cracked gas contained a certain amount of CH_3OH vapor in addition to H_2 and CO. The contents of the three were : 23.3% -46%, 11.6% -23% and 31% -65%. The cylinder pressures at different speeds and loads were measured and the pressure rise rate and heat release rate were calculated. The results show that the cracked gas The maximum engine combustion pressure and pressure rise rate and the maximum heat release rate and cracking rate. For the case of low cracking rate, due to the pyrolysis gas pyrolysis gas slower than gasoline, the maximum combustion pressure and pressure rise rate and the maximum heat release rate is also lower than gasoline; and for high cracking rate conditions, the pyrolysis gas containing The increase of hydrogen makes pyrolysis gas exothermic faster than gasoline, the highest combustion pressure and pressure rise rate of pyrolysis gas are higher than gasoline.